GB850782A - Improvements relating to adjustable metal pit props - Google Patents

Improvements relating to adjustable metal pit props

Info

Publication number
GB850782A
GB850782A GB4151358A GB4151358A GB850782A GB 850782 A GB850782 A GB 850782A GB 4151358 A GB4151358 A GB 4151358A GB 4151358 A GB4151358 A GB 4151358A GB 850782 A GB850782 A GB 850782A
Authority
GB
United Kingdom
Prior art keywords
prop
collar
type
pit
improvements relating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4151358A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB4151358A priority Critical patent/GB850782A/en
Publication of GB850782A publication Critical patent/GB850782A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/14—Telescopic props
    • E21D15/28—Telescopic props with parts held relatively to each other by friction or gripping
    • E21D15/32—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring
    • E21D15/325—Telescopic props with parts held relatively to each other by friction or gripping by a deformable collar or clamping means applied symmetrically inside a locking ring by a clamping ring

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Clamps And Clips (AREA)

Abstract

850.782. Pit-props. BARKER, R. E. May 12, 1959 [Dec. 23, 1958], No. 41513/58. Class 20(2) A telescopic pit-prop has one of more collars 1 frictionally gripping the inner prop-member p to sustain the load. A wedge 7 and a block 9 act together to pull the portion 6 of one end of the collar through a slot 4 in the other end, to tighten it. A corner-piece 10, located by a lug 11 engaging the aperture 5 provides clamping substantially around the whole circumference of the prop-member. A lining 12, preferably of a copper-lead alloy increases the frictional grip. In another form of collar, (Fig. 4 not shown) an eccentric cam provides the wedging action. One of each type of collar is normally provided, the Fig. 1 type providing the initial tightening of the prop and the cam type a finer adjustment of yield pressure.
GB4151358A 1958-12-23 1958-12-23 Improvements relating to adjustable metal pit props Expired GB850782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4151358A GB850782A (en) 1958-12-23 1958-12-23 Improvements relating to adjustable metal pit props

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4151358A GB850782A (en) 1958-12-23 1958-12-23 Improvements relating to adjustable metal pit props

Publications (1)

Publication Number Publication Date
GB850782A true GB850782A (en) 1960-10-05

Family

ID=10420035

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4151358A Expired GB850782A (en) 1958-12-23 1958-12-23 Improvements relating to adjustable metal pit props

Country Status (1)

Country Link
GB (1) GB850782A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109944615A (en) * 2019-04-18 2019-06-28 东北大学 A kind of underground supporting manually ore pillar and erection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109944615A (en) * 2019-04-18 2019-06-28 东北大学 A kind of underground supporting manually ore pillar and erection method

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